SU1358000A1 - Device for measuring authenticity of digital magnetic recording - Google Patents

Abstract

The invention relates to the field of information accumulation. The purpose of the invention is to improve the accuracy of measuring the reliability of a digital magn. records The shift register 22, the comparison unit 19, the switch 9 and the comparison unit 31 perform an error analysis performed by element-wise comparison of the sequence from the output of the AND element 29 and the sequence from the output of the switch 9. The counting-indicator unit 13 provides the calculation and display of the error rate and affects the switch 8, which acts on the stop signal generator 15, turns on its own tape drive mechanism when the error rate threshold is raised. The shift register 24 together with the trigger 26 and the AND element 30 ensures the elimination of error multiplication. The counter 11, together with the decoder 21 and the trigger 25, analyzes the logical zeros during a fallout of the reproduced measuring signal. From the output of the trigger 25 on the element And 27 enters the level of logic "1, allow the passage of clock pulses from the driver 18 clock pulses on the counting unit 32, providing registration of depositions of the reproduced measuring signal. 1 il. i (L with SP oo

Description

The invention relates to the field of accumulation of information, namely, devices for measuring the reliability of a digital magnetic recording.

The purpose of the invention is to improve the accuracy of measuring the reliability of a digital magnetic recording.

The drawing shows one of the possible); Variants of the device for measuring the reliability of a digital magnetic recording.

The device contains a recording amplifier 1 connected by an output to a recording magnetic head 2 and connected by an input to an output of a first switch 3 connected by a first input to one of generator outputs 4 codes connected to information inputs of a multiplexer 5 and inputs of display unit 6, second 7, third 8 and the fourth 9 switches, the first 10 and second 11 counters, the 12 clock pulse generator, the counting and indicating unit 13, the first decoder 14, the stop signal generator 15, reproducing the magnetic head 16, the shaping amplifier Operator 17 Sun10

output to the first input of the comparison unit 19 and to the first input of the fourth switch 9, connected by a second input to the output of the comparison unit 19. An additional block 31 compare (; not connected by the first input to the output of the fourth switch 9. The output of the clock 18 clock pulses is connected to the clock inputs of the first 20, second 22, third 23 and fourth 24 shift registers and to the first input of the first element I 27, connected the output with the start of the additional counting indicator of the 1st unit 32 and connected by the second input to the first output of the first trigger 25. The second output

J5 of the latter is connected to the information input of the third shift register 23, to the first input of the second element 28 and to the first input of the third element 29 connected to the second input to the output of the first shift register 20 connected

20 with the second input of the first flip-flop 25, and the connected SINTERN.C. to the information input of the second shift register 22 and to the second input of the additional comparison unit 31. The output of the latter is connected to

product, 18 clock maker 25 second input of the second | And 28 element,

pulses and block 19 comparison. The multiplexer 5 is connected by i output to the second input of the first switch 3 and is connected by control inputs to the outputs of the first counter 10 connected by the counting input

which is connected by the third input to the output of the third register of the shift 23 and connected by output to the third input of the fourth element AND 30 and to the information input of the fourth register 24 which is connected by the third input to the output of the third register of the 23 shift and connected to the output of the fourth input of the fourth element And 30 and to the information input of the fourth register 24 offset by the generator output 12 clock pulses of the C- Outputs last: -o connected to the inputs connected to the first input of the second

switch 7. Information outputs

counting display unit 13 are connected to

the inputs of the first decoder 14, the outputs

which is connected to the inputs third .mi of the second trigger 26, connected by an output to the second input of the fourth element And 30. The output of the latter is connected to the input of the counting-indicating unit 13, connected by a control output to

switch 8, connected to the output 35 of the third input of the second switch 7.

the input of the driver 15 of the stop signal and to the second input of the second switch 7, the output of which is connected to the input of the generator 4 codes. The reproducing magnetic head 16 is connected to the input of the playback amplifier 17 connected to the input of the clock 18 pulse generator by the output.

The device also contains the first register 20. shift, connected information Measuring the reliability of a digital magnetic recording using the proposed device is as follows. The recording of the measuring signal is produced by 4Q dits of the recording magnetic head 2, to which it is fed from the 4 code generator through the first switch 3 and the recording amplifier 1. In the process of recording the measurement signal, the multiplexer 5, controlled by the first counter 10, with the polling input to the amplifier output, forms all cells of the 4-code generator from the playback clock 17 connected to the control input of the second counter 11 connected by a counting input to the output of the former 18 clock pulses and connected by outputs to the inputs of the second descrambler 21, second 22, third 23 and fourth 24 shift registers, first 25 and second 26 triggers, first 27, second 28, third 29 and fourth 30 elements And, additional block 31 and comparing the additional countable-display unit 32. The first flip-flop 25 is connected to the output of the first input of the second decoder 21. The second shift register 22 connected to the first

Toto, set by the generator 12 clock pulses. In this case, the 4 code generator is in the mode of generating a pseudo-random pulse sequence, and its synchronization is secured by a sync signal received through the second switch 7 of the counting-indication unit 13. The reproducible measurement signal from the reproducing i-amplifier 16 through the amplifier 17 supplied to the first shift register 20, to the clock pulse generator 18 and to the second counter 11. The signal from the first shift register 20 is fed to

55

0

output to the first input of the comparison unit 19 and to the first input of the fourth switch 9, connected by a second input to the output of the comparison unit 19. An additional block 31 compare (; not connected by the first input to the output of the fourth switch 9. The output of the clock 18 clock pulses is connected to the clock inputs of the first 20, second 22, third 23 and fourth 24 shift registers and to the first input of the first element I 27, connected the output with the start of the additional counting indicator of the 1st unit 32 and connected by the second input to the first output of the first trigger 25. The second output

5 of the latter is connected to the information input of the third shift register 23, to the first input of the second element 28 and to the first input of the third element 29 connected to the second input to the output of the first shift register 20 connected

0 with the second input of the first trigger 25, and the connected EYKHODO.CH to the information input of the second shift register 22 and to the second input of the additional comparison unit 31. The output of the latter is connected to

5 second entrance of the second | | o element 28,

the second input of the second | | o element 28,

which is connected by the third input to the output of the third register of the shift 23 and connected to the third input element of the fourth element I 30 and to the information input of the fourth register 24 shift 3- The outputs are last: -o connected to the inputs of the second trigger 26 connected by the output to the second input the fourth element And 30. The output of the latter is connected to the input of the counting and indicating unit 13 connected by a control output to

the third input of the second switch 7.

The measurement of the reliability of a digital magnetic recording using the proposed device is as follows. The recording of the measuring signal is produced by 4Q dits of the recording magnetic head 2, to which it is fed from the 4 code generator through the first switch 3 and the recording amplifier 1. In the process of recording the measuring signal, multiplexer 5, controlled by the first counter 10, processes all generator cells 4 codes per hour 45 all generator cells 4 codes with a frequency specified by the generator 12 clock pulses. In this case, the 4 code generator is in the mode of generating a pseudo-random pulse sequence, and its synchronization is secured by a sync signal received through the second switch 7 of the counting-indication unit 13. The reproducible measurement signal from the reproducing i-amplifier 16 through the amplifier 17 supplied to the first shift register 20, to the clock pulse generator 18 and to the second counter 11. The signal from the first shift register 20 is fed to

55

the first trigger 25 and the third element AND 29, which directly affects the additional comparison unit 31, and through the second shift register 22 and the comparison block 19 - to the fourth switch 9. The second shift register 22, the comparison block 19, the fourth switch 9 and the additional the comparison unit 31 performs an error analysis carried out by element-wise comparison of the after generator of the 18 clock pulses to the additional counting-indicating unit 32, which ensures the recording of depositions of the reproduced measuring signal.

Claims (1)

Invention Formula From the output of the third element 29 and the sequence from the output of the fourth switch 9. At the same time, the second shift register 22 together with the comparison unit 19 generates a signal corresponding to the reference value in the analysis of errors. The signal from the output of the additional comparison block 31 passes through the second element AND 28 to the fourth register 24 ten A device for measuring the validity of a digital magnetic recording, containing a recording amplifier connected by an output to a recording magnetic head, and an input to an output of a first switch connected by a first input to one of the outputs of a code generator, connected directing the measuring signal, reproducing -js to the inputs of the display unit and to the informa- tion without error. This signal serves as the multipathing input inputs, which connected to the output of the second input of the first switch, and the control inputs to the outputs of the first counter connected by the counting input to the output shift and the fourth element AND 30, 20 clock generator, connected acting on the counting indicator to the first input of the second switching unit 13. The latter provides a computer, the output of which is connected to the input, and the display of the multiplexer protection ratio - Indication unit side and acts through the first decipher - connected to the inputs of the inputs of the first 14 to the third switch 8. The last 25 ° of the decoder connected to the outputs of the scientific research institute sets the required value of the inputs of the third switch, output to connected to the input of the stop signal generator, reproducing a magnetic head connected to the amplifier input — the reproducing error rate when detecting rare combinations of code symbols by selecting the corresponding outputs of the first decoder 14. The third switch 8 acts on the stop signal generator 15 connected exit entrance a clock clock, a second decoder, a fourth switch and a comparison unit, characterized in that, in order to improve the accuracy of measuring the reliability of a digital magnetic recording, a clock clock, a second decoder, a fourth switch and a comparison unit, characterized in that, in order to improve the accuracy of measuring the reliability of a digital magnetic recording, 40 This turns off the tape mechanism when the threshold ratio of the error is exceeded when detecting rare combinations of code words. The fourth shift register 24 together with the second trigger 26 and the fourth electron 35 are introduced the first shift register, the connection And 30 ensures the elimination of the information input to the output a playback amplifier connected to the control input of the second counter connected by a counting input to the output of the clock pulse generator, and outputs to the inputs of the second decoder, the first trigger connected to the second input to the output of the second decoder, the second shift register connected by the first output to the first the second trigger 26 in the unit state to the inputs of the comparison unit and the fourth cue according to the signal of the fourth register 24 of the switch connected by the second input with the output of the main unit of comparison, an additional unit of comparison, connected by the first input to the output of the fourth switch, the third and fourth loss of reproducible meter- 50 Shift registers, first, second, third signal. At the same time, the level of logical and fourth elements is And, an additional zero. It is fed from the second output counting and indication unit and the second first trigger 25 to the third register 23 trigger, and the output of the shifter and the second and third elements of the 28 output pulses connected to synchronization and 29. At the same time, from the first output, the safety inputs of the first, second, third flip-flop 25 to the first element AND 27 55 and the fourth shift registers and to the first logical level, the input of the first element And, connected decisive passing a pulse pulse output with an additional input multiplication of errors generated when a distorted bit of a binary signal passes through the second shift register 22. This is ensured by the fact that the fourth shift register 24, when an error signal is received, sets the second trigger 26 to the zero state, blocking the fourth element AND 30. The last lock is stopped when the shear. The second counter 11 together with the second descrambler 21 and the first trigger 25 performs the analysis of logical zeros at from the generator 18 clock pulses to the additional counting and display unit 32, providing registration of depositions of the reproduced measuring signal. Invention Formula ten neither connected to the input a clock clock, a second decoder, a fourth switch and a comparison unit, characterized in that, in order to improve the accuracy of measuring the reliability of a digital magnetic recording, entered the first shift register connected by an information input to the output 40 the counting and indicating unit and the second input with the first output of the first trigger, the second output of which is connected to the information input of the third shift register, to the first input of the second Inc element, to the first output of the first shift register connected to the second input of the first trigger, and connected to the information output of the second the shift register and the second input of the complement I, connected by the third input to the output of the third shift register, and the output to the first input of the fourth element I and to the information input the fourth the first shift register, the outputs of which are connected to the inputs of the second trigger connected by the output to the second input of the fourth element I, the output of which is connected to the input of the counting-indicating unit connected by the control Comparison unit, the output of which is connected to the second input of the second elec- tor by the 10 output to the third input of the second commutation. And connected to the output of the third shift register, and output to the first input of the fourth element And to the information input of the fourth shift register, the outputs of which are connected to the inputs of the second trigger connected to the output of the second input of the fourth element And whose output is connected to the input of the counting and indicating unit connected to the controller